LP2981-28DBVRE4 Equivalent & Substitute Parts

Part Overview

The LP2981-28DBVRE4 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 2.8V output at 100mA in a SOT-23-5 surface mount package. This part is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The device provides positive fixed output configuration with integrated enable control and comprehensive protection features including over-current, over-temperature, and short-circuit protection.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Output Voltage (Fixed)	2.8V
Output Current	100mA
Input Voltage (Max)	16V
Dropout Voltage (Max)	0.37V @ 100mA
Quiescent Current	95 µA
Package	SOT-23-5 (SC-74A)
Operating Temperature	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the LP2981-28DBVRE4 is determined by the following critical parameters:

Fixed output voltage of 2.8V
SOT-23-5 package compatibility
Operating temperature range of -40°C to 125°C
Enable control feature
Surface mount mounting type
ROHS3 compliance

Substitute parts are grouped into two categories:

Parametric Equivalents (Texas Instruments LP2981 Series): LP2981-28DBVR, LP2981-28DBVT, LP2981A-28DBVR, and LP2981A-28DBVT maintain identical electrical specifications including 100mA output current, 0.37V dropout voltage, and 95 µA quiescent current. These differ only in packaging format (Cut Tape vs. Tape & Reel) and product status.

Manufacturer Recommended Alternatives (Microchip Technology): MIC5203-2.8YM5-TR and MIC5205-2.8YM5-TR provide functional equivalence with the same 2.8V output and SOT-23-5 package, but with different output current ratings and electrical characteristics that must be evaluated for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	PSRR	Product Status	Packaging
LP2981-28DBVRE4	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Obsolete	Digi-Reel
LP2981-28DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Obsolete	Cut Tape & Digi-Reel
LP2981-28DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Obsolete	Tape & Reel
LP2981A-28DBVR	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Last Time Buy	Cut Tape & Digi-Reel
LP2981A-28DBVT	Texas Instruments	100mA	0.37V @ 100mA	95 µA	63dB (1kHz)	Active	Tape & Reel
MIC5203-2.8YM5-TR	Microchip Technology	80mA	0.6V @ 80mA	750 µA	Not Specified	Active	Tape & Reel
MIC5205-2.8YM5-TR	Microchip Technology	150mA	0.35V @ 150mA	150 µA	75dB (100Hz)	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

For direct replacement of the obsolete LP2981-28DBVRE4, the LP2981A-28DBVT is the preferred choice. This part maintains identical electrical specifications while offering Active product status, ensuring long-term availability and support. It is ROHS3 compliant and carries the same certifications (REACH Unaffected, EAR99).

The LP2981-28DBVR and LP2981-28DBVT variants provide parametric equivalence but carry Obsolete status, limiting their suitability for new designs despite current inventory availability.

For applications where output current requirements exceed 100mA, the MIC5205-2.8YM5-TR from Microchip Technology offers 150mA capability with superior dropout voltage (0.35V) and PSRR performance (75dB). This part is Active and ROHS3 compliant.

The MIC5203-2.8YM5-TR is suitable only for applications requiring 80mA or less, as it provides reduced output current capacity compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use LP2981A-28DBVT as a direct replacement for LP2981-28DBVRE4?

A: Yes. Both parts deliver identical electrical performance: 2.8V fixed output, 100mA output current, 0.37V dropout voltage, and 95 µA quiescent current. The difference is packaging format (Tape & Reel vs. Digi-Reel) and product status (Active vs. Obsolete). LP2981A-28DBVT is recommended for new designs.

Q: What is the difference between LP2981 and LP2981A variants?

A: Both variants maintain identical electrical specifications for the 2.8V output version. The primary distinction is product lifecycle status: LP2981 is Obsolete, while LP2981A is either Last Time Buy or Active, providing better long-term availability.

Q: Can I substitute MIC5203-2.8YM5-TR for the LP2981-28DBVRE4?

A: MIC5203-2.8YM5-TR is not recommended as a direct substitute. While it provides the same 2.8V output and SOT-23-5 package, its 80mA output current rating is below the original 100mA specification. Additionally, its quiescent current (750 µA) is significantly higher than the LP2981 (95 µA), affecting power efficiency.

Q: Is MIC5205-2.8YM5-TR a suitable alternative?

A: MIC5205-2.8YM5-TR is suitable for applications where 100mA output current is adequate or where higher current capacity (150mA) is beneficial. It offers superior dropout voltage (0.35V) and PSRR (75dB), but higher quiescent current (150 µA). Both parts are ROHS3 compliant and Active status.

Q: Are all substitute parts available in SOT-23-5 package?

A: Yes. All listed substitute parts use the SOT-23-5 (SC-74A) package, ensuring mechanical and electrical compatibility with the original footprint.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts listed are ROHS3 compliant, REACH Unaffected, and classified as EAR99 for export control purposes, matching the original part's compliance profile.

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